Circular knit tubing cutter attachment for sewing machines



De428, 1937. v I c. A. scHEAFFER E-r AL CIRCULAR KNIT TUBING CUTTERATTACHMENT FOR SEWING MACHINES H Filed Feb. l5, 1937 5 Sheets-Shea?I l nvenor Dc. 428, 1937. c. A. scHEAFFER Er AL- 2,103,695

CIRCULAR KNIT TUBING CUTTER ATTACHMENT FOR SEWING MACHINES ssheets-Sheet 2- Filed Feb. l5, 1957 Dec. 28, 1937. c. A. scHr-:AFFER rA. 2,103,595,

CIRCULAR KNIT TUBING CUTTER ATTACHMENT FOR VSEWING MACHINES I Filed Feb.15, 1957 3 sheets-sheet :s

it A iorney s t lPatented Dec. 28, 1937 CIRCULAR 'KNIT TUBING.4 CUTTERArr-Acri; MENT :FOR SEWING MACHINESy Charles A.

chaffer h and F(fLlifto'n. `oil; Peri carcan. Pa. t y

y pplication February 13, 1937', Seriall o. 125,663

- y 2 Claims. invention relates "to new .and useful im vlerovernents lin4sewing machines and more particularly to an attachment whereby knittubingy `can be longitudinally slit as it is advanced toward"tli'enedles of the machine.' Y

Herptofore circular knit tubing was sewed to "the edge portion of thegarment which made a wr'ong side and a right side thereof. However, theprincipal object of the present invention is to .E3-0 '-provide acutting attachment for sewing machines of this character whereby theknit tubing is cut longitudinally and then brought with its edgeportions to a position against opposite sides of the edge portions of agarment, so that by l5 sewing the tubing to th-e garment in thisposition both the outside and the inside of the edge portion of thegarment are alike.

Other important objects and advantages of the invention will becomeapparent to the reader of the following specification.

In the drawings:-

Figure 1 represents a fragmentary side elevational view of the sewingmachine showing the attachment in place.

g5 Figure 2 is a fragmentary top plan view of the of the eccentric armconnected with the scissors.

Figure 9 is a sectional view taken substantially on the line 9 9 ofFigure 8. Figure 10 is a perspective view of the bracket shown in Figure8. i

Figure 11 is a fragmentary side elevational View of the primary guidefor the tubing. Figure l2 is a top plan view of the guide shown inFigure 11.

Figure 13 is a fragmentary front elevational view of a garment after thetubing has` been applied in accordance with the execution of the presentinvention.

Figure 14 is a sectional view of the garment taken substantially on theline I4--I4 of Figure 13.

Referring to the drawings wherein like numeralsdesignate like parts, itcan be seen that the numeral 5 generally refers to a conventional sewingmachine of the type employed for/ sewing said tubing to the edgeportions of .garments and this briefly consists of the case 6.onwhichthe usual rocking arm 'I is located as well `as thevecf centric arm 8. vH As is shown in Figure 8,l the rockingarm 'I is provided ywith alaterally .disposed trunnion 9 which is vdisposed through the sectionalbearing Ill which is adjrustably secured as at II to fone rend of theeccentric arm 8. I 10 In carrying out the present invention, one of thescrewsl I2 for'securing the bearing Illf'intact is disposed through theopening'V I3 of the-L.- shaped bracket I4, the outstanding leg of whichis provided with the notch I5 for receiving the l5 arm I6 which projectsfrom the collar I1 secured to the upper end of the shaft I8 by a setscrew or the like I9.

The shaft I8 extends downwardly through the bearing protuberances 26-2Ion the post 22 and 20 has a Xed collar 23 at its intermediate portion`between which and the bearing 20, a coiled compressible spring 24 isprovided which tends to` urge the shaft I8 downwardly to maintain theblade 25 carried by the lower end thereof ten- 25 sionally against theelongated xed blade 26.

As can be seen in Figures l, 3 and 7, a bracket 21 is employed forsupporting the post V22, the lower end of this bracket being providedwith slots 28 through which securing means 29 are 3(1) .Y

disposed for securing the bracket to the face of the machine. The upperend of this bracket 2l is provided with a laterally extendingplatformlike construction 30 upon which the post 22 is secured and alsothe elongated block 3l upon 35 which the elongated secondary guide 32 issecured with the stationary scissors blade 26 superimposed thereon. Boththe guide 32 and the blade 26 are provided with longitudinally extendingslits 33 at one end through which the machine 40 'screws 34 are disposedand into the block 3|,

thus permitting longitudinal adjustment of the guide. 32 and blade 26on'the block 3l.

The primary guide which is generally referred to by numeral 35 consistsof the elongated arm 45 36 curved upwardly at its outer end portion as'at 31. The same screws 29 are employed for securing the arm 36 inplace.

The upper end of the arm 36 has the laterally disposed portion 38 onwhich the plate 39 is 50 secured, this plate having converging sidewalls 156-40, the same converging toward the -ma chine 5. Upon the wideportion of the plate 39 is the pressure plate 4I this pressure platehavingppenings therein with the studs 42 on the 55 Vwide portion of theplate 39 disposed thereguide member 32. The end of the tube is brought`between the blades 25-26 and the sewing"ma-"`" chine started. As theeccentric varin8 and rock- Y ing arm 'I begin to operate, an:oscillatory motion is imparted to thel arm I6 which pivotsthe scissorsblade 25. Asithe feeding'mechanism of Vthe sewing machine pulls thetubing 45 the scissors thus operate to slit thetubing; and as :thetubing is slit it is first spread apart` by suitable spreading means 45and subsequentlycontracted by thetapering structuren` and as it passesIthis contracting structure` the edgeportions of` the n Vsplit'tubingarebrought against opposite sides of the edge portions of a garment'48and-subse-A quently sewed in this position by the machine 5.

' While the foregoing specification sets forthY `the invention inVspecific terms, it is to beV under- `stood that numerous changes inYthe shape, sizeV -and materials may be resorted to without departingfrom the spirit and scope of the invention asi claimed hereinafter.

;IIaving.described the invention what is claimed 1. In combination, asewing machine, a movable part of the sewing machine, a scissorsstructure secured to the base of the machine adjacent the standard ofthe overhanging arm to sever material as itY advances to the sewingpoint and consisting of a stationary blade anda pivotal blade, aconnection between the pivotal blade and the movable part ofthe sewingmachine, and material guide means for guiding Vthe matey rial to thescissors, said guide means consisting of an elongated guide nger uponwhich the stationary blade is secured and beyond the free end of whichthe' Iingerprojects.

2.V Incombination, a sewing machine, a movablepart cfthesewing machine,a scissors struc- I turesecured to the base of the machine adjacent thestandard of the overhanging arm to sever Imaterial asit advances to thesewing point and consisting of a stationary bladeV and Y a pivotalblade, afconnection between the pivotal blade and thelmovable part ofthe machine, materialguide meansfcir"guidingiriateriall to the scissors,said guideV meansfconsisting of an elongated guide finger uponwhichthe-stationaryblade Vi's disposed,Y securing meansfor said bladeandYguide finger, saidsecuring -means being -lcommon to 'both'thestationary blade and` guide Ylinger,said `stationary blade beingprovided withal'longitudin nal slot therein through which thesaidsecuring means is disposed.

CHARLES A. SCHEAFFER. CLIFTON c. FOIL.

